<template>
  <div>
    <!--面包屑导航区域-->
    <el-breadcrumb separator="/">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item><a href="/">权限管理</a></el-breadcrumb-item>
      <el-breadcrumb-item>角色列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!--卡片视图区域-->
    <el-card>
      <!--添加角色 按钮区域-->
      <el-row>
        <el-col>
          <el-button type="primary">添加角色</el-button>
        </el-col>
      </el-row>
      <!--角色列表区域-->
      <el-table :data="rolesList" border stripe>
        <el-table-column type="expand"> <!--添加展开列-->
          <template slot-scope="scope">
            <el-row :class="['bdbottom', i1 === 0 ? 'bdtop':'','vcenter']" v-for="(item1,i1) in scope.row.children" :key="item1.id">
              <!--渲染一级权限-->
              <el-col :span="5">
                <el-tag closable @close="removeRightById(scope.row, item1.id)"> {{item1.authName}}</el-tag>
                <i class="el-icon-caret-right"></i>
              </el-col>
              <!--渲染二级和三级权限-->
              <el-col :span="19">
                <el-row :class="[i2 === 0 ? '' : 'bdtop','vcenter']" v-for="(item2,i2) in item1.children" :key="item2.id">
                  <el-col :span="6">
                    <el-tag type="success" closable @close="removeRightById(scope.row,item2.id)">{{item2.authName}}</el-tag>
                    <i class="el-icon-caret-right"></i>
                  </el-col>
                  <el-col :span="18">
                    <el-tag type="warning" v-for="(item3) in item2.children"
                            :key="item3.id" closable @close="removeRightById(scope.row,item3.id)">{{item3.authName}}</el-tag>
                  </el-col>
                </el-row>
              </el-col>
            </el-row>
          </template>
        </el-table-column>
        <el-table-column type="index"></el-table-column>   <!--添加索引列-->
        <el-table-column label="角色名称" prop="roleName"></el-table-column>
        <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
        <el-table-column label="操作" width="300px">
          <!--插槽-->
          <template slot-scope="scope">
            <el-button type="primary" icon="el-icon-edit" size="mini">编辑</el-button>
            <el-button type="danger" icon="el-icon-delete" size="mini">删除</el-button>
            <el-button type="warning" icon="el-icon-setting" size="mini"
                       @click="showSetRightDialog(scope.row)">分配权限</el-button>
          </template>
        </el-table-column>

      </el-table>
    </el-card>
    <!--展示分配权限的对话框-->
    <el-dialog
      title="分配权限"
      :visible.sync="setRightDialogVisible"
      width="50%" @close="setRightDialogClosed">
      <!--树形控件-->
      <el-tree :data="rightsList" :props="treeProps"  show-checkbox node-key="id"
               default-expand-all :default-checked-keys="defKeys" ref="treeRef"></el-tree>
      <span slot="footer" class="dialog-footer">
        <el-button @click="setRightDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="allotRights">确 定</el-button>
      </span>
    </el-dialog>

  </div>
</template>

<script>
export default {
  name: "Roles",
  data() {
    return {
      /* 用于存角色列表的数据 */
      rolesList: [],
      /* 控制分配权限对话框的显示与隐藏 */
      setRightDialogVisible: false,
      //所有的权限数据
      rightsList: [],
      //树形控件的属性绑定对象
      treeProps: {
        label: 'authName',
        children: 'children'
      },
      //默认选中的节点Id值数组
      defKeys: [],
      //当前即将分配权限的role的id
      roleId: ''
    }
  },
  created() {
    this.getRolesList();
  },
  methods: {
    /* 获取角色列表 */
    async getRolesList() {
      const {data: res} = await this.$http.get('roles')
      if(res.meta.status !== 200){
        return this.$message.error("请求角色列表失败！")
      }
      this.roleList = res.data;
    },
    /* 根据id删除对应的权限 */
    async removeRightById(role,rightId) {
      /* 弹框提示是否确认删除 */
      const confirmResult = await this.$confirm('此操作将永久删除该权限, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)
       if(confirmResult !=='confirm') {
          return this.$message.info('取消了删除！')
       }
       const {data: res} = await this.$http.delete('roles/${role.id}/rights/${rightId}')
      if(res.meta.status!==200){
        return this.$message.error("删除权限失败！")
      }
      role.children=res.data;

    },
    /* 展示分配权限的对话框 */
    async showSetRightDialog(role) {
      this.roleId = role;
      /* 获取所有权限的数据 */
      const {data: res} = await this.$http.get('rights/tree')
      if(res.meta.status!==200){
        return this.$message.error("获取权限数据失败")
      }
      this.rolesList = res.data;
      /* 递归获取三级节点的id */
      this.getLeafKeys(role,this.defKeys);
      this.setRightDialogVisible = true;
    },
    /* 通过递归的形式，获取角色下所有三级权限的ID，并保存到defKeys数组中 */
    getLeafKeys(node,arr) {
      //没有children则表明是三级节点
      if(!node.children){
        return arr.push(node.id)
      }
      node.children.forEach(item =>{
        this.getLeafKeys(item,arr)
      })
    },
      /* 监听分配权限对话框关闭事件 */
    setRightDialogClosed() {
      this.defKeys = []
    },
    /* 点击确定为角色分配权限 */
    async allotRights() {
      const keys=[
        ...this.$refs.treeRef.getCheckedKeys,
        ...this.$refs.treeRef.getHalfCheckedKeys
      ]
      const idStr = keys.join(',')
      const {data: res} = await this.$http.post('roles/${this.roleId}/rights',{rids: idStr})
      if(res.meta.status !== 200){
        return this.$message.error("分配权限失败！")
      }
      this.$message.success("分配权限成功！")
      this.getRolesList();
      this.setRightDialogVisible = false;

    }

  }

}
</script>

<style lang="less" scoped>
  .el-tag{
    margin: 7px
  }
  .bdtop{
    border-top: 1px solid #eee;
  }
  .bdbottom{
    border-bottom: 1px solid #eee;
  }
  .vcenter{
    display: flex;
    align-items: center;
  }
</style>
